Flamingos live in large groups called colonies. Some colonies consist of million birds. Baby flamingos will hatch in the nest made of mud. Flamingos are monogamous (they have just one partner) and they produce one egg each year. ... The visible "knee" of the flamingo is actually ankle joint.

The lesser flamingo's eggs and chicks are preyed upon by several birds. The lappet-faced and white-headed vultures feed on eggs, young flamingos, and dead flamingos. The Egyptian vulture feeds mostly on flamingo eggs. This bird has also been observed dropping and destroying eggs that it does not eat.

Flamingos at San Francisco Zoo. In the wild, flamingos eat algae, crustaceans, brine shrimp, diatoms, and aquatic plants. At the zoo, a special “flamingo fare” is served. To preserve their rosy color at the zoo, flamingos are fed a commercially prepared diet high in carotenoids.

Flamingos filter-feed on brine shrimp and blue-green algae. Their bills are specially adapted to separate mud and silt from the food they eat, and are uniquely used upside-down. The filtering of food items is assisted by hairy structures called lamellae which line the mandibles, and the large rough-surfaced tongue.